[Buildroot] [git commit branch/next] tor: explain why we use -std=gnu99

[Peter Korsgaard]

commit: http://git.buildroot.net/buildroot/commit/?id=86ae63af0529327df6aad8b1acd5c9af0bc28a32
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/next

[Missed from 5cf5b390 (fix building if GCC's C standard is not gnu99)]
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/tor/tor.mk |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/package/tor/tor.mk b/package/tor/tor.mk
index f6d3b7f..a464391 100644
--- a/package/tor/tor.mk
+++ b/package/tor/tor.mk
@@ -32,6 +32,7 @@ else
 TOR_CONF_OPTS += --disable-seccomp
 endif
 
+# uses gnu extensions
 TOR_CONF_ENV = ac_cv_prog_cc_c99='-std=gnu99'
 
 $(eval $(autotools-package))